A catheter connector

Abstract

The present invention discloses a catheter joint, comprising: a joint body, an insertion bead and a nut; the joint body comprises a main body cylinder, an outer cylinder and an inner cylinder, the outer cylinder is coaxially protruded from the main body cylinder to one side of its axial direction, the outer cylinder and the inner cylinder are surrounded to form a groove opening to one side of the axial direction, the inner cylinder is arranged on the radial inner side of the outer cylinder and is coaxially protruded from the main body cylinder in the same direction as the outer cylinder in such a way that the protruding end is closer to the main body cylinder side than the protruding end of the outer cylinder; the insertion bead comprises an embedding end which is embedded in the joint body and is in a cylindrical shape, and a catheter connecting end which is away from the embedding end, the embedding end is detachably embedded in the inner side of the groove to form a sealing part; the catheter connecting end is radially protruded in a direction away from the axial center; the purpose of the present invention is to provide a catheter joint which can utilize the kinetic energy of the fluid flowing inside the catheter joint to make the catheter joint have better sealing performance.

Description

Technical Field

[0001] The present invention relates to a connector, and more particularly to a catheter connector. Background Art

[0002] In the manufacturing process of semiconductor manufacturing, medical and pharmaceutical products manufacturing, food processing and industrial fields, various fluids (such as high-purity liquid medicine, high-purity chemical reagents, etc.) are required, and these fluids must be transported through catheters in machines and equipment. Catheter connectors are required to connect the catheters and the catheters and the equipment. If the sealing of the catheter connector is not good enough or does not meet the standards, leakage will occur at the connector. Obviously, this situation cannot occur, so a catheter connector with excellent sealing effect is needed to avoid such a situation.

[0003] At present, in the Japanese patent document with the publication number JP2799562B2, a resin pipe joint is disclosed, including a joint body, a sleeve and a fastener; when it is used, the catheter is sleeved on one end of the sleeve, and then the other end of the sleeve is connected to the joint body, and finally the catheter and the sleeve are further fastened to the joint body using the fastener, so as to achieve a sealing connection effect at the catheter joint.

[0004] In the invention patent document with the authorization announcement number CN1064461130B, a resin pipe joint is disclosed, which also includes a joint body, a sleeve and a fastener. When in use, the catheter is sleeved on one end of the sleeve, and the other end of the sleeve is connected to the joint body. Finally, the catheter and the sleeve are further fastened to the joint body using a fastener. In this scheme, the insertion rate and magnification of the insertion part into the groove part are further limited, so as to achieve a better sealing effect.

[0005] It can be seen that in the prior art solutions, only the characteristics of the catheter joint material and the characteristics of part of the structure are used to improve the sealing effect when the catheter is connected. Summary of the invention

[0006] In view of the shortcomings of the prior art, the object of the present invention is to provide a catheter joint that can utilize the kinetic energy of the fluid flowing inside the catheter joint to make the catheter joint have better sealing performance.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a catheter joint, comprising: a joint body, an insertion bead and a nut; the joint body comprises a main body cylinder, an outer cylinder and an inner cylinder, the outer cylinder is coaxially protruded from the main body cylinder to one side of its axial direction, the outer cylinder and the inner cylinder are surrounded to form a groove opening to one side of the axial direction, the inner cylinder is arranged on the radial inner side of the outer cylinder and is coaxially protruded from the main body cylinder in the same direction as the outer cylinder in such a way that the protruding end is closer to the main body cylinder side than the protruding end of the outer cylinder; the insertion bead comprises an insertion end in a cylindrical shape which is embedded in the joint body and a catheter connection end away from the insertion end, the insertion end is detachably embedded in the inner side of the groove to form a sealing portion; the catheter connection end is radially protruded in a direction away from the axial center; the nut is threadedly connected to the joint body; a flow channel for fluid circulation is arranged inside the joint body and the insertion bead; a first guide surface is arranged in the inner circumferential direction of the flow channel inside the catheter connection end, and the radial dimension of the first guide surface gradually decreases toward the opening of the catheter connection end.

[0008] The present invention is further configured as follows: the outer surface of the catheter connecting end includes a first contact surface and a second contact surface, the first contact surface is arranged close to the opening of the catheter connecting end, the second contact surface is arranged close to the direction of the bead embedding end, the first contact surface and the second contact surface are arranged as planes or arc surfaces; the first guide surface is arranged in the bead inlet flow channel corresponding to the first contact surface.

[0009] The present invention is further configured as follows: a second flow guiding surface is connected to a terminal end of the first flow guiding surface, and the first flow guiding surface and the second flow guiding surface form an annular groove.

[0010] The present invention is further configured as follows: the first guide surface is configured as a plane or a curved surface.

[0011] The present invention is further configured as follows: the second guide surface is configured as a plane or a curved surface.

[0012] The present invention is further configured as follows: the axial width of the first guide surface along the entry bead is set to be between 3mm and 15mm; the radial height of the first guide surface along the entry bead is set to be between 0.1mm and 4mm.

[0013] The present invention is further configured as follows: the total width of the first guide surface and the second guide surface along the axial direction of the bead is set between 3mm and 15mm; the radial height of the second guide surface along the bead is the same as the radial height of the first guide surface along the bead.

[0014] The present invention is further configured as follows: the edge of the first guide surface is configured as a rounded corner.

[0015] The present invention is further configured such that edges of the first guide surface and the second guide surface are both configured as rounded corners.

[0016] The present invention is further configured as follows: a horizontal connecting surface is connected between the first contact surface and the second contact surface.

[0017] By adopting the above technical solution, during the specific use of the catheter joint, when the fluid in the tube flows through the first guide surface of the constriction from the uniformly thick flow channel, it will generate an impact force on the first guide surface along the flow direction, and this impact force can be used to strengthen the sealing pressure of the sealing part in the catheter joint, thereby achieving a better sealing effect. At the same time, the setting of the constriction in the flow channel here makes the flow velocity of the fluid relatively faster and the pressure smaller when flowing through this place, and it will have a tendency to flow to the center of the flow channel, which makes it difficult for the catheter connection end and the location where the catheter is connected to leak, and the sealing effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below in conjunction with the accompanying drawings:

[0019] Figure 1 This is a schematic structural diagram of a first embodiment of a catheter connector of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the bead in the second embodiment of the catheter connector of the present invention;

[0021] Figure 3 This is a schematic diagram of the structure of the bead in the third embodiment of the catheter connector of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the bead in the fourth embodiment of the catheter connector of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the bead in the fifth embodiment of the catheter connector of the present invention;

[0024] Figure 6 This is a schematic diagram of the structure of the bead in the sixth embodiment of the catheter connector of the present invention;

[0025] Figure 7 This is a schematic diagram of the structure of the bead in the seventh embodiment of the catheter connector of the present invention;

[0026] Figure 8 This is a schematic diagram of the structure of the bead in the first embodiment of the catheter connector of the present invention;

[0027] Fig. 9 This is a schematic diagram of the structure of the bead in the eighth embodiment of the catheter connector of the present invention;

[0028] Fig.10 This is a partial enlarged view of the insertion bead into the connector body;

[0029] Fig.11 This is a partial enlarged view of the nut being tightened;

[0030] Fig.12It is a schematic diagram of the fluid flowing from left to right in Example 1;

[0031] Fig.13 It is a schematic diagram of the fluid flowing from right to left in Example 1.

[0032] In the figure: 1. joint body; 11. main body cylinder; 12. outer cylinder; 13. inner cylinder; 14. groove; 2. bead; 21. embedded end; 211. top of embedded end; 212. bottom of embedded end; 22. conduit connecting end; 221. first guide surface; 222. second guide surface; 223. first contact surface; 224. horizontal connecting surface; 225. second contact surface; 23. annular groove; 231. fillet; 3. nut; 4. conduit; 5. flow channel; 6. first sealing surface; 7. second sealing surface. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0035] Reference Figures 1 to 13 A catheter connector embodiment of the present invention is further described.

[0036] Embodiment 1:

[0037] like Figure 1A catheter joint shown in the figure comprises a generally cylindrical joint body 1, a generally cylindrical entry bead 2 and a generally cylindrical nut 3, one end of the entry bead 2 is detachably sealedly connected to the joint body 1, and a sealing portion is formed at the position where the entry bead 2 is inserted into the joint body 1; the other end of the entry bead 2 is connected to a catheter 4, the nut 3 is threadedly connected to the joint body 1, and when connected, the catheter 4 is fastened to the joint body 1 by squeezing the entry bead 2, and at the same time, a second sealing surface 7 is formed on the surface of the entry bead 2 that contacts the catheter 4 and the nut 3; a flow channel 5 for fluid circulation is provided inside the joint body 1 and the entry bead 2, and a first guide surface 221 is further circumferentially provided in the flow channel 5 inside the catheter connection end 22, wherein the radial dimension of the first guide surface 221 away from the joint body 1 is smaller than the radial dimension of the first guide surface 221 close to the joint body 1, that is, the first guide surface 221 is axially contracted toward the second sealing surface 7 along the entry bead 2. Furthermore, a second flow guiding surface 222 is connected to the first flow guiding surface 221 on the side close to the joint body 1 , so that an annular groove along the circumference of the inner wall of the inlet bead 2 is formed by the first flow guiding surface 221 and the second flow guiding surface 222 .

[0038] In the present embodiment, the connector body 1 comprises a main body cylinder portion 11, an outer cylinder portion 12 and an inner cylinder portion 13, and a groove portion 14 opening to one side in the axial direction is formed between the outer cylinder portion 12 and the inner cylinder portion 13, and the opening direction of the groove portion 14 faces the side of the bead 2; and a chamfer is provided inwardly at one end of the outer cylinder portion 12 away from the main body cylinder portion 11 to facilitate the embedding of the bead 2; further, the bead 2 comprises an embedding end 21 embedded in the connector body 1 and a catheter connecting end 22 away from the embedding end 21 and connected to the catheter 4, wherein a detachable sealed connection between the bead 2 and the connector body 1 is achieved by the embedding cooperation of the embedding end 21 and the groove portion 14. More specifically, the embedding end 21 is further provided with: the outer diameter of the embedding end 21 is substantially the same as the inner diameter of the outer cylinder portion 12, such as Fig.10 The figure shows a partial enlarged view of the embedding position of the bead 2 in the joint body 1 during specific use. Due to the thickness setting of the embedding end 21, a first sealing surface 6 is formed after it is embedded in the groove 14.

[0039] In this embodiment, the catheter connection end 22 of the bead 2 is protruded in the direction away from the axial center, forming a first contact surface 223 and a second contact surface 225; the inner diameter of the nut 3 away from the joint body 1 is larger than the inner diameter of the bead 2 and smaller than the maximum outer diameter of the protrusion of the catheter connection end 22. This arrangement allows the nut 3 to press its edge against the surface of the first contact surface 225 of the bead 2 through the catheter 4 when tightened; at the same time, the protruding catheter connection end 22 makes it more difficult for the catheter 4 on its surface to fall off. The schematic diagram of the nut 3 tightening the catheter 4 on the surface of the bead 2 by squeezing the bead 2 is shown in the figure. Fig.11As shown, this connection method forms a second sealing surface 7 between the conduit 4 and the conduit connection end 22. Furthermore, in this embodiment, we set the first contact surface 223 and the second contact surface 225 as inclined surfaces, and a horizontal connection surface 224 is connected between the first contact surface 223 and the second contact surface 225. The horizontal connection surface 224 is used to increase the contact area between the protruding part of the conduit connection end 22 and the conduit 4, increase the friction between the conduit 4, make it difficult to fall off, and blunt the sharp angle of the original protrusion, reduce damage to the conduit 4, and increase its service life.

[0040] In this embodiment, the specific positions of the first guide surface 221 and the second guide surface 222 are further set on the inner side of the conduit connection end 22 of the bead 2, and the edges of the first guide surface 221 and the second guide surface 222 are both set to fillets 231. Furthermore, the first guide surface 221 and the second guide surface 222 are set to curved surfaces with the same curvature, so that the flow channel 5 can be more rounded and the fluid can flow more smoothly when flowing, while reducing the wear on the edges of the first guide surface 221 and the second guide surface 222, thereby increasing the service life of the bead 2. Here, the radial height of the first guide surface 221 and the second guide surface 222 along the bead 2 is set to 2 mm, and the total width of the first guide surface 221 and the second guide surface 222 along the axial direction of the bead 2 is set to 10 mm.

[0041] In order to obtain the above specific size data, we set up some experiments. The radial heights of the first guide surface 221 and the second guide surface 222 along the bead 2 are 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, and 4mm respectively; the total widths of the first guide surface 221 and the second guide surface 222 along the axial direction of the bead 2 are 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, and 15mm. A total of 56 beads 2 of different sizes are grouped as a group, which are divided into three groups. Leakage tests are carried out under 0.75MPa, normal temperature conditions and 0.097MPa, 180℃ conditions. In order to simulate the actual working conditions, all parts of the catheter joint and 56 beads 2 are uniformly heated (150℃, 1 hour) and cooled (temperature 25℃, 6 hours) 10 times before the experiment. Before the experiment, two groups of beads 2 without the first guide surface 221 or the second guide surface 222 were set up at the same time in the flow channel 5, and the two groups of beads 2 were subjected to leakage tests under the conditions of 0.75MPa and normal temperature and 0.097MPa and 180°C. It was recorded that the leakage time of the beads 2 under the conditions of 0.75MPa and normal temperature was 43752 hours, and the leakage time of the beads 2 under the conditions of 0.097MPa and 180°C was 8747 hours.

[0042] Table 1: Sealing time of leakage test under 0.75MPa and normal temperature conditions

[0043]

[0044] Table 2: Sealing time of leakage test under the conditions of 0.097MPa and 180℃

[0045]

[0046] According to the above-mentioned experiments, the following conclusions can be drawn: All beads 2 provided with the first guide surface 221 or the second guide surface 222 have improved sealing properties compared with the control group under the conditions of 0.75MPa, normal temperature and 0.097MPa, 180°C, regardless of how their sizes change; under the same working conditions, the higher the radial height of the first guide surface 221 and the second guide surface 222 along the bead 2, the better the sealing effect, and the wider the total axial width of the first guide surface 221 and the second guide surface 222 along the bead 2, the better the sealing effect. However, if the height or total width of the first guide surface 221 and the second guide surface 222 is set larger, it will affect the amount of material at the conduit connection end 22, which will reduce the service life of the entire conduit joint. Therefore, taking the sealing performance and service life of the bead 2 into comprehensive consideration, the height of the first guide surface 221 and the second guide surface 222 is selected to be 3 mm, and the total width of the first guide surface 221 and the second guide surface 222 along the axial direction of the bead 2 is selected to be 11 mm as the most preferred embodiment.

[0047] In the specific use process, according to the different flow directions of the fluid inside the catheter connector, it is generally divided into two working conditions.

[0048] Working condition 1: The fluid flows out from the connector body 1, flows through the inlet bead 2, and finally flows into the conduit 4.

[0049] like Fig.12 As shown, the force analysis is performed inside. The fluid flows in the direction of V1. When it flows from the narrow cross section to the first guide surface 221 and the second guide surface 222 in the flow channel 5, the cross section of the flow channel 5 suddenly becomes larger, so the fluid will generate an impulse F1 on the surface of the first guide surface 221 along its flow direction. By decomposing this force, we know that the component force of the impulse F1 can be regarded as an additional sealing pressure for the second sealing surface 7, which can make the sealing effect of the second sealing surface 7 better. At the same time, due to the setting of the shape of the first guide surface 221, the fluid close to the first guide surface 221 does not flow horizontally when it flows out of the bead 2, but flows along the tangent direction of the edge of the first guide surface 221. Therefore, when the fluid flows out of the bead 2, the possibility of the fluid penetrating into the second sealing surface 7 is reduced. In other words, the sealing effect of the second sealing surface 7 is increased.

[0050] Working condition 2: The fluid flows in from the conduit 4, flows through the inlet bead 2, and finally flows into the connector body 1.

[0051] like Fig.13 As shown, the force analysis is performed inside. The fluid flow direction is V2. When it flows from the narrow section in the conduit 4 to the first guide surface 221 and the second guide surface 222 in the inlet bead 2, the cross section of the flow channel 5 suddenly increases, so the fluid will generate an impulse F2 on the surface of the second guide surface 222 along its flow direction. By decomposing this force, we know that the component force of the impulse F1 for the first sealing surface 6 can be regarded as an additional sealing pressure, which can make the sealing effect of the first sealing surface 6 better.

[0052] Embodiment 2:

[0053] The difference between the second embodiment and the first embodiment is only in the structure of the beads 2. Figure 2 Specifically, in the second embodiment, only the first flow guide surface 221 is provided without the second flow guide surface 222, and the first flow guide surface 221 is provided as an inclined surface instead of an arc surface. Such a setting in the second embodiment can only achieve a better sealing effect on the second sealing surface 7 when the flow direction of the fluid in the pipe is from the joint body 1 to the inlet bead 2 and finally flows into the conduit 4. When the flow direction of the fluid is opposite, it cannot utilize its own kinetic energy to achieve a better sealing effect.

[0054] Embodiment three:

[0055] The difference between the third embodiment and the first embodiment is only in the structure of the beads 2. Figure 3 As shown. Specifically: in the third embodiment, only the first reverse flow surface 221 is provided and the second guide surface 222 is not provided. At the same time, the first guide surface 221 is set as an inclined surface instead of an arc surface, and further, the first contact surface 223 and the second contact surface 225 are both set as arc surfaces. Such a setting method of the third embodiment can only achieve a better sealing effect on the second sealing surface 7 when the flow direction of the fluid in the tube is from the joint body 1 to the inlet bead 2 and finally flows into the catheter 4. When the fluid flows in the opposite direction, it cannot utilize its own kinetic energy to achieve a better sealing effect. At the same time, the first contact surface 223 and the second contact surface 225 are set in an arc shape, and the catheter 4 is more likely to slip off when it is sleeved on the catheter connection end 22.

[0056] Embodiment 4:

[0057] The difference between the fourth embodiment and the first embodiment is only in the structure of the beads 2. Figure 4 Specifically, the first guide surface 221 and the second guide surface 222 in the fourth embodiment are inclined surfaces, while those in the first embodiment are curved surfaces. The curved surface arrangement can make the fluid flow more smoothly compared to the arrangement in the fourth embodiment.

[0058] Embodiment five:

[0059] The difference between the fifth embodiment and the first embodiment is only in the structure of the beads 2. Figure 5 As shown. Specifically, the first guide surface 221 and the second guide surface 222 set in the fifth embodiment are inclined surfaces, and the first contact surface 223 and the second contact surface 225 are arcuate surfaces. Compared with the first embodiment, the arcuate first guide surface 221 and the second guide surface 222 can make the fluid flow more smoothly than the inclined first guide surface 221 and the second guide surface 222. At the same time, the arcuate first contact surface 223 and the second contact surface 225 are not conducive to the catheter 4 being sleeved outside the catheter connection end 22, and are more likely to slip off.

[0060] Embodiment six:

[0061] The sixth embodiment is different from the first embodiment only in the structure of the beads 2, such as Figure 6 Specifically, the second flow guide surface 222 is not provided in the sixth embodiment. Such a setting can only provide a better sealing effect on the second sealing surface 7 when the flow direction of the fluid in the tube is from the joint body 1 to the inlet bead 2 and finally flows into the conduit 4. When the fluid flows in the opposite direction, its own kinetic energy cannot be used to provide a better sealing effect.

[0062] Embodiment seven:

[0063] The difference between the seventh embodiment and the first embodiment is only in the structure of the beads 2. Figure 7 As shown. Specifically: In the seventh embodiment, the second flow guide surface 222 is not provided, and the first contact surface 223 and the second contact surface 225 are provided as arc surfaces. Such a setting can only achieve a better sealing effect on the second sealing surface 7 when the flow direction of the fluid in the tube is from the joint body 1 to the inlet bead 2 and finally flows into the conduit 4. When the fluid flows in the opposite direction, it cannot utilize its own kinetic energy to achieve a better sealing effect. At the same time, the arc-shaped first contact surface 223 and the second contact surface 225 are not conducive to the conduit 4 being sleeved outside the conduit connection end 22, and are more likely to slip off.

[0064] Embodiment eight:

[0065] The difference between the eighth embodiment and the first embodiment is only in the structure of the beads 2. Fig. 9 Specifically, the first contact surface 223 and the second contact surface 225 in the eighth embodiment are configured as arc surfaces, which is not conducive to the catheter 4 being sleeved outside the catheter connection end 22 and is more likely to slip off.

[0066] The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A catheter connector, comprising: A connector body, an insert bead and a nut; the connector body comprises a main body cylinder, an outer cylinder and an inner cylinder, the outer cylinder is coaxially protruding from the main body cylinder to one side of its axial direction, the outer cylinder and the inner cylinder are surrounded to form a groove opening to one side of the axial direction, the inner cylinder is arranged on the radial inner side of the outer cylinder and is coaxially protruding from the main body cylinder in the same direction as the outer cylinder in such a way that the protruding end is closer to the main body cylinder side than the protruding end of the outer cylinder; the insert bead comprises an insert end in a cylindrical shape which is embedded in the connector body and a conduit connecting end away from the insert end, the insert end is detachably embedded in the inner side of the groove to form a sealing portion; the conduit connecting end is radially protruding in a direction away from the axial direction; the nut is threadedly connected to the connector body; the connector body and the insert bead are both provided with flow channels for fluid circulation; the conduit connector is characterized in that a first guide surface is provided in the inner circumferential direction of the flow channel inside the conduit connecting end, and the radial dimension of the first guide surface gradually decreases toward the opening of the conduit connecting end; The outer surface of the catheter connecting end includes a first contact surface and a second contact surface. The first contact surface is arranged close to the opening of the catheter connecting end, and the second contact surface is arranged close to the bead embedding end. The first guide surface is arranged in the bead flow channel corresponding to the first contact surface.

2. The conduit connector according to claim 1, characterized in that: The first contact surface and the second contact surface are configured as plane surfaces or arc surfaces.

3. The conduit connector according to claim 2, characterized in that: The end of the first guide surface is connected to the second guide surface, and the first guide surface and the second guide surface form an annular groove.

4. The conduit connector according to claim 2 or 3, characterized in that: The first guide surface is configured as a plane or a curved surface.

5. The conduit connector according to claim 3, characterized in that: The second guide surface is configured as a plane or a curved surface.

6. The conduit connector according to claim 1 or 2, characterized in that: The axial width of the first guide surface along the bead entry is set to be between 3mm and 15mm; the radial height of the first guide surface along the bead entry is set to be between 0.1mm and 4mm.

7. The conduit connector according to claim 3, characterized in that: The total width of the first guide surface and the second guide surface along the axial direction of the bead is set to be between 3mm and 15mm; the radial height of the second guide surface along the bead is the same as the radial height of the first guide surface along the bead.

8. The conduit connector according to claim 1 or 2, characterized in that: The edge of the first guide surface is configured as a rounded corner.

9. The conduit connector according to claim 3, characterized in that: The edges of the first guide surface and the second guide surface are both rounded.

10. The conduit connector according to claim 2, characterized in that: A horizontal connecting surface is connected between the first contact surface and the second contact surface.

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